FIXUP fixed double free issue.

Calls to zip_stream_close free the buffer provided in zip_stream_open.
Because of all of the internal reallocs that may happen on the buffer
passed to zip_stream_open, I think the cleanest flow is that the user
expects zip_stream_open to take management of their buffer and then
get the updated zip via zip_stream_copy as a new buffer.

test/test_entry.c

@@ -424,8 +424,8 @@ MU_TEST(test_entries_delete_stream) {
   zip_stream_copy(zip, (void **)&modified_zdata, &zsize);
   mu_check(modified_zdata != NULL);
 
+  // Note that zip_stream_close will free the zdata passed in zip_stream_open
   zip_stream_close(zip);
-  free(zdata);
   zdata = NULL;
 
   zip = zip_stream_open(modified_zdata, zsize, 0, 'r');